Transverter



Dec. 13, 1955 H. D. CAHILL TRANSVERTER (RECORDER-CONTRGLLER) l2 Sheets-Sheet l Filed Nov. 2l, 1952 /NVE/v To@ H D. CAH/LL A TTORNFY Dec. 13, 1955 H. D. cAHlLL TRANSVERTER (REC ORDER-CONTROLLER) Filed NOV. 2l, 1952 l2 Sheets-Sheet 2 /A/l/EA/of? By H. D. CAH/LL Dec. 13, H. D CAHILL TRANSVERTER RECORDER-C ON TRGLLER Filed Nov. 2l, 1952 l2 Sheets-Sheet 3 I 'l l`l'll l /NVENTOR By CAH/LL Dec. 13, 1955 H. D. CAHILL.

TRANSVERTER (RECORDER-CONTRGLLER) l2 Sheets-Sheet 4 Filed Nov. 2l, 1952 LJLI /NL/ENTOR By H. D. CAH/LL ATTORNEY Dec. 13, 1955 H. D. cAHlLL TRANSVERTER (RECORDER-CONTROLLER) l2 Sheets-Sheet 5 Filed Nov. 2l, 1952 n.. R/ WM WC WD.o H VI 5 m. UNK

ATTORNEY Dec. 13, 1955 H. D. cAHlLL 2,727,092

TRANSVERTER REC ORDER-C ON TRGLLER Filed Nov. 21, 1952 12 Sheets-Sheet 6 /A/l/E/VTOR H D CAH/LL BV f A TTORNEV Dec. 13, 1955 H. D. cAHlLL TRANSVERTER (RECORDER-CONTROLLER) l2 Sheets-Sheet 7 Filed Nov. 21, 1952 A TTOR/VEY Dec. 13, 1955 Filed Nov. 2'1, 1952 TRANSVERTER (RECORDER-CONTROLLER) H. D. CAHILL l2 Sheets-Sheet 8 ATTORNEY l2 Sheets-Sheet 9 Filed Nov. 2l, 1952 /NVENTOR By H. D. CAH/LL m .um

ATTORNEY Dec. 13, 1955 H. D. cAHlLL 2,727,092

TRANSVERTER (RECORDER-CONTRGLLER) Filed Nov. 2l, 1952 l2 Sheets-Sheet lO /Nl/EA/TOR H D CAH/LL A TTOR/VEY Dec. 13, 1955 H. D. cAHxLL 2,727,092

TRANSVERTER (RECORDER-commun) Filed Nov. 21. 1952 12 sheets-sheet 11 RELA YS WHEN REQl//RED FOREIGN AREA COMPRESSED CODE RELA V5 F465 F466, /FREQU/RL'D H D. CAH/LL BV -l ATTORNEY H. D. CAHILL 2,727,992

TRANSVERTER (RECORDER-CONTROLLER) 1952 l2 Sheets-Sheet. 12

DIG/TAL PUNCH POSITIONS IVO IVO

Dec. 13, 1955 Filed Nov. 21,

U STATION |oo0oo l CALLED OFF/CE CODE B C ooooolooooo|0oooo l l i T l Iooooolooooo l {CALL IDENTITY INDEX ooooo U ISTTION ooooo lo ooooloocooiooooo l CALLED OFF/CE CODE B C ooolooooo|ooooo l FOREIGN AREA CODE l B i Iooooo l oo ooo|ooooo CALL IDENTITY /NDEX l U OOOOOOOOOO l /Nl/ETOR ATTOP/VEV OOOOOIOOOOO NUMBER ooooo IOO A oooooloooooiooooo CALLED No. smc/ETUDE O O O O O MESSAGE /NDEX l 9 CALLED lNL/MDED CALLED No. STRUCTURE 0- 2 IO O O O O l l C 1 O l l l CALL/NG NUMBER MESSAGE /NDEx O 0 O 0 O POS/T/N DES/GVT/ONS l 0 I TH ooolooooo No.AHEA l coDE |F 0 ooolooooo LOCAL AREA ENTY/NDE/Y 2 l 3 OOO 0000000000 TH ooooo NO'PE CODE 0 0 ooo ooooo A; B O 0 ooloooo my; EX; 0 l oooiooooo VTPV/NDEX EN TR y /NDEX i E/vrm/ INDEX ENT/W l /NDEX O O O EN my /NDEx United States Patent O TRANSVERTER (RECORDER-coNrnnLr-nn;

Harold D. Cahill, Scarsdale, N. Y., assigner to Beli Telephone Lahoratories, Incorporated, New York, N. Y., a corporation of New York Application November 21, 1952, Serial N o. 321,786

Claims. (Cl. 179-7) This invention relates to recorder controllers, and more particularly to certain novel improvements in the recor er controller disclosed in Patent No. 2,599,358 granted lune 3, 1952, to H. D. Cahill et al., and commonly referred to therein as the transvertelz When used in telephone systems which are adapted to automatically record on a plurality of lines across a continuous recording tape, or medium, items of billable information pertaining to telephone connections, the transverter provides a number of electrical paths between the registers that are operated to express the information to be recorded and the recording magnets which are to record the information, and to so control the switching of the conductors constituting said paths that each item of information is correctly routed thereover from a given register to the appropriate group of magnets which are to record the item in the right line of the recording medium and in the right position on the line predetermined for the item.

in common control automatic telephone systems of the cross-bar type exemplied, for example, by the one shown in Patent No. 2,585,904, granted February 19, i952, to A. I. Busch, and for which the transverter and associated equipment disclosed in the above-mentioned patent to Cahill et al. furnishes, in part, the recording facilities to record the details of connections established through the office, there are, in general, three record entries made on the recording tape for each call; an original entry, an answer time entry, and a disconnect time entry. rThe rst entry, generally referred to as the initial entry, consists of two lines if the call is to be bulk billed, and four lines if it is to be individually billed, that is, if a detailed statement of the call is to be furnished the subscriber from whose station the call was placed, or if, for any other reason, the operating company desires a detailed statement of the call. When such a statement is to be furnished for the call, the initial entry will consist of four lines, the iirst line of which contains the called number, the second line the called oiiice code and two items of miscellaneous information, the third line the calling number, and the fourth line the trunk identity and message index.

This four-line initial entry is schematically indicated in Fig. 13B, and it is there to be observed that the width of the recording tape is such as to provide space for recording six digits A F thereacross. Five punch positions are provided for each of the tive digits B F, while three punch positions are provided for the digit A. As shown in Fig. 13A, the ve punch positions for each of the digits B F are given the designations 0, l, 2, 4, 7 for convenience, and the value of each digit is preferably recorded by the selective punching of two holes out of five in the well-known two-out-of-five code given below:

ICE

T wo-out-of-ve code Digit: Code holes punched 0 7, 4 l O, 1 2 0, 2 3 l, 2 4 0, 4 5 1, 4 6 2, 4 7 7, 0 8 7, 1 9- 7, 2

lt will be noted that for each digit except O, the sum of the designations of the two punched holes equals the value of the digit represented by the holes.

The A digit never exceeds the value 2, and each of the three punch positions reserved for the digit are given the designations 0, l and 2, a hole punched in any one indicating the digit designated by the hole.

For the purpose of nationwide dialing, it has been found desirable to divide the national area and certain contiguous areas into a number of zones, or so-called foreign areas, and to assign to each of such areas a code XOX or XlX which identifies the area. When a subscriber in one area seeks to establish a connection to a subscriber in an oiice located in another area, he rst dials the three digits of the cailed foreign area, and then follows it with the letters and/ or digits of the called office therein and the digits that constitute the directory number of the called subscriber.

Calls to foreign areas obviously come in the category of detailed billed calls, and it is necessary as part of the details of a call to be so billed to include the code of the foreign area, it being possible to have similarly designated offices in different foreign areas, in which case the billed subscriber could only identify the oce he called if informed of the foreign area in which it is located. ln View of the fact that no provision is made at the present time for recording foreign area codes as parts of initial entries, it becomes necessary in automatic exchanges adapted for nationwide dialing and having call recording equipment, to provide the necessary facilities with which to record the foreign area code as a constituent part of the initial entry. Since the initial entry made by the recorder under control of the transverter now consists of four lines, as above noted, it is desirable to expand such entry by one line, thus making the initial entry a five-line entry instead of a four-line entry.

Accordingly, one of the features of the present invention is a novel circuit arrangement in the transverter by means of which, on foreign area calls, the transverter, in response to the regis *ation of a foreign area code, will control the operation of the recording mechanism to record said foreign code in certain digital positions in an additional line of the four-line entry, and thus make said entry a five-line entry.

At the present time and in certain areas in which the telephone exchange facilities have been adapted for automatic call recording, said areas have each been given a single identifying digit, and the automatic accounting devices which process the record tapes containing said digits severally as part of diferent four-line entries, recognize the digit and accord it the required treatment. With the advent of nationwide dialing, however, such single digit area indications have each been superseded by three-digit foreign area codes, to conform to similar codes assigned to other areas. Since the existing automatic accounting devices in the areas previously designated by single digits are not adapted to recognize three-digit foreign area codes, it is desirable in areas which are served by such accounting devices to compress the new three-digit foreign area codes into the single digit codes previously assigned to such areas, and to record such single digit for a call in the B digit location of the second line of the involved four-line initial entry.

Accordingly, another feature of the present invention is the provision in the transverter of certain novel circuit arrangements by which a foreign area code which is not to be recorded as dialed, on the tape in an additional line of the initial entry (tive-line initial entry) is compressed into a single digit and recorded in an appropriate digital location in one of the lines of the regular four-line initial entry, which would be thel kind of an entry produced for a foreign area call in which the foreign area code is compressed.

Yet another feature of the invention is a novel form of register in the transverter by which the above-mentioned code-compression operations are effected, in that those compression codes which have identical first and second digits operate a relay common to such codes, through whose contacts are then severally controlled the circuits of the relays individual to each of the codes.

The above and other features of the invention will be more clearly understood from the following description and appended claims, taken in connection with the attached drawing in which:

Fig. l schematically represents the originating register, n

marker and outgoing register extending through suitable connectors to the transverter connector;

Figs. 2 through ll include those portions of the transverter disclosed in the above-mentioned Cahill et al. patent which appertain to the present invention; Figs. 2 and 3 showing the arrangement by which the various conductor groups incoming from the sender are selectively switched to different groups of recording magnets of the recorder; Fig. 4 schematically indicating the recorder; Figs. 5, 6 and 7 showing the foreign area digit registers; Fig. 8 showing the stations register; Figs. 9 and l0 showing the progress circuit; while Fig. ll shows the code compression circuit;

Fig. l2 shows how Figs. l to ll, inclusive, should be arranged to completely disclose the invention, while Figs. 13A, 13B and 13C show, respectively, the five digital punch positions for each of the tive digits B F recorded across the tape; a four-line initial entry, and a tive-line initial entry in accordance with one feature of the present invention.

Before describing the operation of the invention, a brief review of the general operation of the transverter, unmodified by the present invention, will be given with respect to the production of four-line initial entries.

The originating sender R, indicated in Fig. l, if not arranged for nationwide dialing, is provided with eight numerical registers A H which are settable in reresponse to dial impulses from the calling station to register the called office code and the called subscribersk number, the registers being utilized in the following order for the purpose:

Information Registered Firstl digit of the called code digit.

Second digit of the called code digit.

Third digit of tho called code digit. Thousands digit of called subscribers number. Hundreds digit of called subscribcrs number. Tens digit of called subseri s number.

Units digit of called subscribers number.

Stations digit ol" called subscribers number.

l When all of the registers have been operated, connection 1s effected with the marker M, and the called ofce code contained in the A, B, and C registers is transmitted thereto for translation into routing, class of call, and other items necessary for the establishment of the connection. The result of this translation is the selection, in the marker M, of a route relay individual to the code, which relay supplies, besides the above, also information which is useful to the transverter. Thus it determines whether the call is to be bulk-billed or individually billed, and in so determining determines whether the initial entry to be recorded for the call is to be a two-line initial entry in the event that the call is to be bulk-billed, or a fourline initial entry in the event that the call is to be separately billed; and it determines whether the called otlce code is a single digit code,`a two-digit code or a threedigit code (in the former two cases the codes would, of course, be registered in the Azdigit register and in the A and B digit registers, respectively). All of this information the transverter must have in order to insure that the digits which comprise the numerical portion of the called number, including the station digit if dialed, will always appear on the record in the proper places allocated therefor. For, as previously stated, the nurnber of digits in the called oiiice code may vary from one to three digits on interoflice calls, and the outgoing register R attaches the numerical registers to the calling line in the sequenceV above given. A three-digit office code call, for example, would come in as A, B, C, TH, H, T, U and Station, if dialed, whereas a two-digit office code call would come in as A, B, TH, H, U and Station, the thousands digit being registered in the C register, the hundreds digit in the D register, etc. In the latterV case, and because the digital positions on the entry spaces of the tape are invariably allocated to specific digits, it is necessary for the transverter to rearrange these digits so that they will appear on the tape in theV order A, 0, B, TH,

H, T, U and Station. The second digit of the ofce code is improvised, as would also be the station digit if no station digit is dialed, since each of the digital spaces in the record entry must either contain a significant digit or a zero.

All of the above information is, as has been stated, obtained from the appropriate route relay in the marker M, which operates in response to the translation of the oflice code digits transmitted to the marker from the originating register R. The marker M, on an interoflice connection, thereafter obtains access to outgoing sender S through a suitable connector, and to storage registers in the sender the information made available to the marker, and other information contained in the originating register R, including the numerical digits of the called number, are forwarded from the originating register R to the outgoing sender S.

The sender S, among its other functions, obtains access to a transverter through the medium of a trausverter connector TC, and over two of the live conductors in the conductor group CP selectively operatesin the transverter from the route relay-operated registers in the sender two relays of the five code pattern relays designated CPG, CP1, CP2, C134 and CP7 (of which only relays CP2 and CP7 are shown) in the two-out-of-five code to indicate the number of digits in the called office code, whether the call is locally terminated, or interoice, or extended (suburban), etc. in accordance with which two of the relays CP) CP7 are operated codewise, a circuit is completed by said relays to operate a switching relay individual to the code pattern indicated by the number of digits in the code (there being one such relay for each code pattern) and through the contacts of this operated switching relay, conductor groups incoming from the storage registers of the sender are extended in appropriate order to the magnets of the recorder shown in Fig. 4. For a local three-digit interoice call for which a four-line initial entry is to be made, the two operated relays in the group of relays CPO CP7 indicating such a call complete the circuit (not shown) of a switching relay designated L3E, the contacts of which, in groups, are schematically shown in Fig. 2, and indicated therein by the designations 1L3E tLSE, each such contact except Contact QLSE representing a group of ve contacts. The incoming conductor groups A H which extend 'to different contact groups in all switching relays severally operated by the code pattern relays CPG CP7 in accordance with the type of call, are further extended through the contacts of certain relays to be mentioned later, and through the recorder connector RC (Fig. 4) to the appropriate punch magnet groups MBS, MB1, MEZ, M84, M137 MFG, MF, MFZ, MP7. Since the conductor groups A H are selectively grounded by the storage register in the sender S in the two-out-of-live code to express the values of the digits stored in said storage registers, circuits are completed over said conductors to the involved recorder magnets in the above-mentioned magnet group, thereby to cause the operation of said magnets and punch holes in the record medium, or tape, to record the dif-'its in the variaus digital positions in the two-out-ofive code.

Thus, for example, and referring to the portion of the circuit and equipment shown in Figs. l, 2, 3, 4 and 5, and tcthe four-line initial entry illustrated in Fig. 13B, it may be assumed that relays CPS CP7 are selectively operated in the two-outot`five code to indicate a threedigit interotice call involving the production of a four-line initial entry, all in consequence of the selective operation of said relays, relay LSE individual to this type of call is operated, closing contacts 1L3E 161.313. 'when trai erter becomes connected to the recorder R by the opera.-on of the recorder connector RC in the manner described in the above-mentioned Cahill et al. patent, with relay operated, and when the recorder is ready to the called line number in the first line or" the entry (as evidenced by the operation of relay C4 in the manner hereinafter to be described), conductor D having two conductors grounded therein to express the thousands digit of the called number is extended over contacts LEE and the contacts of relay C4, to the windings of recording magnets MB@ MB?, which are then selectively opeA ted in the two-out-oi-live code by the ground on the two conductors in conductor group D to record the thousands digit of the called line number in the B digit space of the iirst line of the entry on the tape, as indicated in Fig. 13B.

Conductor .Uro-up E, selectively grounded by the sender in the two-ou -ive code to express the hundreds digit c-f the called line number, is extended over contacts SLSE and over the co; ts of relay C4, to the windings of recording magnes rviCll MC7 which are then selectively operated the two-out-o-iive code by the two grounded conductors in said conductor group E to record he hundreds digit ot the called line number in the C digit space of the tirs? line, as indicated in Fig. 13B.

Conductor group r', selectively grounded in the sender in the two-out-o-ve code to express the tens digit of the called line number, is extended over contacts 6L3E, and over the contacts of relay C4, to the windings of magnets tlDll MD? (not shown), which are then selectively' operated in the two-out-of-ve group by the two grounded conductors in said conductor group F to record the tens digit of the called line number in the D digit space in the lirst line or" the entry, as indicated in rig. 13e.

Conductor group G, selectively grounded in the sender in the two-out-of-ve code to express the units digit of the called line number, is extended over contacts 7L3E, and over the contacts of relay Cfii to the windings of recording magnets "Eil M57 (not shown), which are then selectively operated in the two-out-of-iive code by the two grounded conductors in said group G to record the units digit in the E. digit space of the first line of the entry, as indicated in Fig. 13B.

In connection with the stations digit, and for certain functions of the transverter which are not pertinent to an understanding of the present invention, the circuit is so arranged that the stations digit registered in storage register H of the sender is transferred to a stations register of the transverter, which register is shown in Fig. 8, and this transrer takes place over conductor group H, contacts SLC-1E, to the windings of relays STO ST7 in the stations register, which relays are selectively operated in the tWo-out-oftive cod to express the value of the stations digit. If no station constitutes a part of the called number the sender grounds the one conductor in conductor group H which extends to the winding of relay ST7 which, in operating, completes the circuit of relay EST. If the relays ST@ ST7 have been operated in the tWo-out-of-ve code to register the value of the stations digit recording nagnets MF@ MP7 are then similarly operated in the two-out-of-ve code from grounds supplied by the two operated relays of the stations register to record the stations digit in the F digit space of the first line of the entry, as indicated in Fig. 13B. If no digit is registered in the stations register, but relay EST is operated instead, then said relay and relay ST7 will ground the two conductors which extend to the windings of recording magnets MF4 and "/lF', causing said magnets to operate and record the git in said F digit space.

When the rlrst line of the entry is punched, relay C4 is released, and when the recorder R is ready to punch the second line of the entry, evidenced by the operation of relay C3 as more particularly pointed out hereinafter, conductor groups A, B and C incoming, respectively, from registers A, B and C in the sender S, are extended, respectively, over Contact groups LSE, ZLSE, 3L3E, over the contacts ot relay C3, to the recorder magnet groups lvl-Dil MD?, MEQ ME7, and MPO MP7. Said magnets are then selectively operated in the two-outot-ve code by the grounds applied in the sender to two conductors in each of said conductor groups to record the three digits of the omce code in the D, E and F digit spaces in the second line of the entry, as indicated in Fig. 13B. The magnet group MBt) MB7 is closed through contacts in relay C3 to the contact group 10L3E over which they extend a separate circuit (not shown) on which is registered a digit indicating the number of the calling area. Ground is selectively applied in the two-out-of-ve code to two conductors or" said group to operate two of the magnets MB@ MB7 and record in the B digit space in the second line of the entry the digit indicating the area, as indicated in Fig. 13B.

Magnet group MC@ MC? is operated to record the called number structure in the C digit space; that is, whether the numerical portion of said number consists of four digits, live digits, etc. lf the number consists of four digits, relay A:DG is operated from the sender, and when relay C3 operates for the recording of the second line of the entry, a circuit is completed from ground on the No. 2 contacts of relay 4DG, conductor 162, No. 3 contacts of relay C3, to magnet MCG (not shown) to battery. Another circuit is completed from ground on the No. 3 contacts of relay lDG, conductor 163, No. 6 contacts of relay FAL, conductor 164, No. 4 contacts of relay PACK, conductor 165, No. 4 contacts of relay CK, winding of magnet MC1 (not shown) to battery. These two magnets operate and record the digit l in the C digit space in the second line of the entry as an arbitrary indication that the numerical portion of the called number consists of four digits. ln the same manner, if the number consists of five digits, relay SDG will be operated from the sender, in which event ground applied to conductor 162 will cornplete the previously described circuit for magnet MCO, while ground applied to conductor 165 over the No. 2 contacts of relay SDG completes the circuit of MC2 via conductor 165, No. 3 contacts of relay EST, conductor 166, No. 5 contacts of relay C3, winding of magnet MC2 (not shown) to battery. The operation of magnets MCO and MC2 causes the digit 2 to be punched in the C digit space as an arbitrary indication that the numerical portion of the called number consists of ve digits.

When the recorder has punched the second line of the entry, relay C3 is released, and when it is ready to punch the third line relay C2 is operated (as will be described hereinafter), whereupon the recorder magnet groups MCO MC7 MFG MP7 are connected through to a calling line number register, not shown but indicated in Fig. 4, having therein the registration of the calling line directory number, as set forth in the abovernentioned Cahill et al. patent, whereupon said magnet groups are selectively operated in the two-out-of-iive code by said registers to record said directory number in the four digit spaces C. F in the third line of the entry. Also at the same time, recorder magnet group MBS MB7 is extended to another register (not shown but indicated in Fig. 4) which contains the registration of a single digit denoting the identity of the calling oiiice, and this digit is caused to be registered in the two-out-of-iive code in the B digit space on the second line of the entry, all as indicated in Fig. 13B.

When the recorder has punched the third line of the entry, relay C2 is released, and when said recorder is ready to punch the fourth and last line of the entry, relay C1 is operated in the manner to be hereinafter described. The latter relay, over its No. 2 contacts, completes the circuit of recorder magnet MA2, which operates to record the digit 2 in the A digit position, which digit indicates that the line is the last line of the entry though since the record is analyzed in reverse, said last line is usually referred to as the first. Over its Nos. 3, 4, 5 and 6 contacts, circuits are completed for magnet MBO, MB1, MBZ and MB4 in accordance with the character of the entry. If the entry is a four-line initial entry not involving foreign area dialing, relays 4L and NOB are operated from the sender over circuits, not shown, whereupon a circuit is completed from ground on the No. 2 contacts of relay NOB, No. 4 contacts of relay 4L, conductor 166, No. 4 contacts of relay C1, winding of recording magnet MB1 to battery. Another circuit is completed from ground on the No. l contacts of relay NOB, conductor 167, No. 7 contacts of relay FAL, conductor 168, No. 3 contacts of relay 4L, conductor 169, No. 5 contacts of relay C1, winding of magnet MBZ, to battery. Magnets MB1 and MBZ operate to record the digit 3, indicating a four-line initial entry, as shown in Fig. 13B.

Relay C1 also connects a magnet group MCG MC7 to a message billing index register in the transverter (not shown but indicated in Fig. 4) which is operated from the sender to register the billing index, and which is instrumental in operating said magnet group in the two-outof-iive code to record said index to the C digit space of the line. rl`wo conductors connecting with the magnets MD7 and MD4 are grounded by the operation of relay C1 to record the improved digit 0 in the D digit space. The two digital spaces E and F in the fourth line of the entry are not utilized by the transverter but by another circuit called the trunk indexer which has registered therein the numerical identity of the trunk over which the connection takes place. The indexer operates the magnets directly from its own setting but, of course, through a connector since said indexer is common to a plurality of trunks.

When the telephone system disclosed in the abovementioned Busch patent is adapted for nationwide dialing, the original register R is provided with three additional dial registers I, J and K. Remembering that in dialing foreign area calls the three digits of the foreign area code XGX or XIX are dialed ahead of the called office code and the numerical portion of the called subscribers directory number, all of the dial registers, including the three additional registers I, J and K are utilized as follows and in the indicated order to register all of the dial digits.

Information Registered Registers First Digit of the Foreign Area Code. Second Digit of the Foreign Area Code, Third Digit of the Foreign Area Gode. First Digit of the Office Code.

Second Digit of the Ofce Code.

Third Digit of the Office Code. Thousands Digit.

stations Digit.

The sender S, of course, must be similarly equipped with three additional storage registers which are operated responsive to the setting of the three additional dial registers in the originating register R. ln the case of foreign area dialing, however, the foreign area code (registered in registers A, B and C of the originating register R) is transferred to the marl-1er, and causes therein by suitable translation the operation of a route relay individual to the foreign area code, and this relay, as in the case of a route relay operated for a non-foreign area call, supplies the transverter with the required information as to the character of the initial entry, code pattern, etc.

Since the present invention pertains to a novel modication of the transverter for the production of initial entries involving as part of said entries the recording of foreign area codes as dialed or as compressed, there is shown in Fig. l incoming from the sender S and through the transverter TC eleven conductor groups A K, each group pertaining to one of the digits of the maximum of eleven that may be dialed for a foreign area call. Since all conductor groups are uniformly used in the twoout-of-iive code to express the numerical value of digits according to the code, each conductor group is identified by a capital letter designating the storage register in the sender S whence said conductor group originates, and each conductor in the group is further designated by a numeral of the 'live expressing the two-out-of-five code. Thus the iive conductors A0, A1, A2, A4 and A7 constitute the conductor group extending to the A storage register in the sender, which register, it will be recalled, stores the first of the three digits of the foreign area code when a foreign area call is dialed. The conductors are then selectively grounded in the two-out-of-live code by said register to indicate the value of the A digit stored therein. In the same manner, conductor groups B0 B7 KG K7, respectively, extend to those registers in the sender which are designated by the letters of the groups, the conductors in each of said groups being similarly and respectively grounded in the two-out-oftive code by said registers to express the values of the B K digits, respectively, stored therein.

Having described the general operation of the transverter in respect to its control of the recorder for the production of four-line initial entries pertaining to calls which are to be separately billed, I will now describe its modification and operation in accordance with the present invention, to enable it to control the recorder R for the production of tive-line initial entries and four-line initial entries pertaining to foreign area calls in which, in the case of live-line initial entries, the foreign area code is recorded in the third line of the entry, by way of example, exactly as dialed, and which in the case of four-line initial entries, the three digits of the foreign area code are compressed into a single digit and recorded (again by way of example) in the B digit space of the second line of the entry.

When the transverter is seized and connected to the originating register R, the marker M and the outgoing sender S by way of the several connectors, including the transverter connector TC, relays CKG, 4L and NOB are operated over circuits (not shown) completed in the sender S. Further, ground is supplied on conductor CKS, whereupon a circuit is completed for relay CKS,

said circuit being traced from ground o n said conductor CKS, contacts of relay CKG, conductor 121, No. 3v contacts of relay FALK, No. 4 contacts of relay FABC, conductor 122, certain other control contacts on relays (not shown) of the transverter, winding of relay CKS, to ground. Relay CKS operates to supply ground to certain off-normal control conductors, and operates relay CK7 over an obvious circuit, which latter relay, in operating, also supplies ground to certain other ott-normal conductors.

By the operation of the transverter connector TC, the transverter is connected to the outgoing sender S which, in turn, is connected to the marker, and the marker to the originating register, all over appropriate connectors, as indicated in Fig. l. As previously stated, the marker, in response to the translation of the three digits of the foreign area code received from the originating register R, operates a route relay individual to that particular code. Among its other functions, the operated route relay causes conductors CP2 and CP7 to be grounded and thereby complete the circuits of the code pattern relays CP2 and CP7. These relays operate and then lock over their respective No. l contacts, conductor 123, No. 2 contacts of relay CKS, to ground. The operation of relays CP2 and CP7 register the digit 9 in the tWo-out-of-ve code, which digit indicates to the transverter that the call being established is a foreign area call, the foreign code XOX or XlX of which will either have to be recorded as dialed or compressed Consequently When relays CPZ and CP7 have operated, a circuit is completed for relay FCI, said circuit extending from ground, serially through the No. 2 contacts of relays CP2 and CP7, conductor 124, No. 3 contacts of relay FACK, conductor 125, Winding of relay FCl, to battery. The latter relay operates and extends the conductors in the three conductor groups FA() FA7, FB?! FB7 and FC() FC7 to the windings of the relays of foreign area digit registers A, B and C, respectively Said conductors FAO, FAI, FAZ, FA4 and FA7 are connected, respectively, to conductors At?, A1, A2, A4 and A7 of conductor group A, which extend to the outgoing sender S, and are therein selectively grounded in the two-out-of-tive code in accordance with the dialed value of the rst, or A digit, of the foreign area code XOX or XlX, in which the rst X represents the A digit, or l represents the B digit, and the second X represents the C digit; that the four conductors FBS, FBI, FB4 and FB7 are connected, respectively, to conductors B0, B1, B4 and B7 of conductor group B, which extends to the outgoing sender S and are there selectively grounded in the two-out-of-ve code in accordance with whether the dialed value of the second, or B digit, of the foreign area code is 0 or l, leads B0, BI being grounded if the B digit has the value 1, and leads B4 and B7 being grounded if the B digit has the value G; and that the ve conductors FCO, FCI, FCZ, FC4 and FC'.' are connected respectively to conductors C0, C1, C4 and C7 of conductor group C, which extend to the outgoing sender S and are therein selectively grounded in the two-out-of-ve code in accordance with the dialed value of the third, or C digit, of the foreign area code. Each of said leads FAG FC7 connects with the winding of a relay having a similar designation in the appropriate foreign area digit register; for example, conductor FAQ extends to the winding of relay FAO in the A digit register; conductor FBO extends to the Winding of relay FBS in the B digit register; conductor FC() extends to the winding of relay FCO in the C digit register, etc.

Consequently, when the conductor groups A, B and C have been selectively grounded in the sender to express the three digits A, B and C of the foreign area code, and because relay FCI has been operated, these three digits will become respectively registered in the foreign area registers A, B and C.

Thus, for example, if the dialed foreign area code is 203, conductors A0 and A2 will be grounded in the A conductorv group, conductors B4 and B7 will be grounded in the B conductor group, and conductors C1 and C2 will be grounded in the C conductor group. Since relay FCI is operated, ground on conductor Ail will cause relay FA() in digit register A to be operated over a circuit which extends from ground on said conductor A0, conductor FAD, No. l5 contacts on relay FCI, winding of relay FAO, to battery; ground on conductor A2 will cause relay FAZ in digit register A to be operated over a circuit which extends from ground on said conductor AZ, conductor FAZ, No. 13 contacts of relay FCI, Winding of relay FAZ, to battery; ground on conductor B4 Will cause relay FB4 in digit register B to be operated over a circuit extending from ground on said conductor B4, conductor FB4, No. 8 contacts of relay FCI, Winding of relay FB4, to battery; ground on conductor FB7 will cause relay FB7 in digit register B to be operated over a circuit extending from ground on said conductor B7, conductor FB7, No. 7 contacts on relay FCl, winding of relay FB7 to battery; ground on conductor C1 will cause relay FCI in digit register C to be operated over a circuit extending from ground on said conductor C1, conductor FCI, No. 5 contacts on relay FCI, winding of relay FCI, to battery; ground on conductor C2 will cause relay FCZ in digit register C to be operated over a circuit extending from ground on said conductor C2, conductor FCZ, No. 4 contacts on relay FCI, winding of relay FCZ, to battery. The operation of relays FAG and FAZ registers the digit 2 in digit register A; the operation of relays FB4 and FB? register the digit 0 in digit register B, while the operation of relays FCI and FCZ registers the digit 3 in digit register C. In the same manner, every one of the ten digits l 9 will be registered in the given twoout-of-ve code in digit registers A and C, the digits registered in register B being limited to 0 and 1, since said last two digits, and said last two digits only, indicate a foreign area call. In the event, however, that the B digit for a foreign area call should, by error, become registered as any other digit, the subsequent check of the setting of the three registers will reveal the error and block further operations, as will be described.

When the registers A, B and C have been operated, a check is made to insure that two relays, and only two, have been operated in each of registers A and C, and relays FBO and FBI, or FB4 and FB7 have been operated in register B. This check involves relay FABC, which operates under the conditions assumed to have occurred. Thus if the foreign code is 203, relays FAG and FAZ should have been operated in register A, relays FB4 and FB7 in register B, and relays FC and FCZ in register C, as before described. Consequently a circuit is then cornpleted extending from ground on the No. l front contacts of relay FAQ, No. 3 contacts of relay FAI, No. 2 contacts of relay FAZ, No. 3 back contacts of relay FA4, No. l back contacts of relay FA?, conductor 131, No. l back contacts of relay FB, No. l contacts of relay FBI, No. l contacts of relay FB4, No. l contacts of relay FB7, conductor 132, No. 2 contacts of relay FCB, No. 2 contacts of relay FCI, No. l front contacts of relay FCZ, No. 2 back contacts of relay FC4, No. 2 back contacts of relay FC7, right winding of relay FABC, to battery. Relay FABC operates and over its No. 3 contacts applies its own operating ground to the left winding of relay FALK which also operates.

In the event that less than two relays operate in the registers A, B and C, the check lead will not be closed through and relay FABC will not operate. All subsequent operations of the transverter are then suspended, Whereupon, after a short time interval measured by a master time-alarm circuit not shown in the present disclosure but shown and described in the above-mentioned H. D. Cahill et al. application, an alarm is sounded and the transverter disabled. Should three relays operate in reg- -way of illustration).

11 isters Afor C, or should the relays of register B operate in aV combination other than relays FB() and FBI for the digit 1, and relays FB7 and FB4 for the digit 0, then a special alarm will be given. Thus, for example, if relays FB() and FB4 operate in register B, the ground previously traced to conductor 131 may further be traced over the front contacts of relay FBG, No. l() back contacts of relay FBI, No. 1l contacts of relay FB4, conductor 170,

through other controlling paths (not shown), winding of relay ALP, to ground. Relay ALP operates and cornpletes the circuit of a suitable alarm. 1t will be evident from an inspection of the circuit that if three relays operate in register A or three relays operate in register C, the above-traced ground will be similarly applied to conductor 17() and thereby complete the circuit of alarm relay ALP. Operations of t'ne transverter following the operation of relay FABC upon successful check of the registers will be described later.

As previously stated, foreign area codes are characterized by the fact that the B digit therefor is either l or O, the iirst and third digits of each of the codes being any assignable value from to 9, inclusive. However, since some of the foreign area codes are to be fully recorded as dialed in the third line of a live-line initial entry, while nine oi these codes are each to be compressed into a single digit O 8 and recorded in the B digit space of the second line of a four-line initial entry, it becomes necessary to prearrange the digit registers to distinguish between those codes which are to be recorded in the entry as dialed and those nine (9) codes which are to be cornpressed into a single digit.

yThis distinction between the two groups of codes is accomplished by arranging for suitable cross-connections between conductors 21, 31, 41, 51, 61, 71, 81 and 91 (representing the partial code X1) at the stationary contacts of relay FBI and one of the windings of relay FASD (the left winding, for example); and between conductors 20, 3i), 4t), Si), 5t), 7i), 8() and 9() (representing the partial code XG) at the stationary contacts of relay FB7 and another winding of relay FASD (the middle winding, by In this connection, it should be noted that the ve relays FALl FA7 of the digit register A, when operated in the two-out-of-ive code to express each of t'ne digits 2, 3, 4, 5, 6, 7, 8 and 9, selectively ground two conductors in the group of conductors i2. 9 extending to the armatures 2 9 of relay F31), and two conductors in the group of conductors 2 9 extending to the armatures 2 9 of relay PE4. The stationary contacts which make with the armatures 2 9 of relay FB() are severally and respectively connected to correspondingly numbered armatures on relay FBIL, while the stationary contacts making with the latter armatures and expressing the rst two digits X1 of foreign area codes which are to be recorded as registered (that is, as dialed) are commoned and connected to the left winding of relay FASD over conductor 125. On the other hand, each stationary contact on relay FBT which expresses the iirst two digits X1 of a foreign area code which is to be compressed, is individually connected to the winding of one of the translating relays FAB- in Fig. ll, as, for instance, contact 81 which, by means of conductor 129, is connected to the winding of relay FAB-S1.

In the same manner, the conductors 20, 30, 40, 50, 60, 70, 8() and 9G connected to the stationary contacts of relay FB7 and expressing the first two digits X0 of foreign area codes which are to be recorded as dialed, are commoned and connected over conductor 127 to the middle winding of relay FASD, while those contacts which express the tirst two digits X0 of foreign area codes which are lto be compressed into a single digit, are extended to the windings of translating relays as, for instance, the conductor which is connected to the winding of 'relayfFABZO over conductor 128.

Since relays FB() yand FBI operate when the B digit of the foreign area code is l, it follows that when the foreign area code comprises any digit 2 9 for the A digitand digit l for the B digit, a circuit path is completed for relay FA3D for each code which is to be recorded Yas dialed, that is, for each code indicated by a contact on relay FB1 that has been extended to the left winding vof relay FASD. Thus, for example, if the A and `B digits of a foreign area code are 21, the A digit 2 will result in the operation of relays FA() and FA2, and the B digit 1 in the operation of relays FB() and FBI, all as above described. Since the No. 9 contacts of relay FBI are connected to conductor 126, and the latter is Y connected to the left winding of relay FASD, then upon the operation of relays FAO, FA2, FB() and FBI, a circuit is'completed which extends from ground on the No. 2 contacts of relay FAD, No. 10 contacts of relay FA2, conductor 2, No. 9 contacts of relay FBO, No.9 contacts of relay FBI, conductor 126, left winding of relay FASD, to battery. In the same manner with the other value of the A digitr(except 1 or 0 which are not used), the fact that the B digit is 1 and results in the operation of relays FBO and FBI will cause the completion of a circuit path to the left winding of relay FA3D over appropriate contacts of the two operated relays of the register A and the contacts of the two operated relays FB() and FB1 of the digit register B.

Similarly for those partial codes recorded as dialed and whose tirst two digits are X0. Remembering that for such two digits relays VF134 and FB7 are operated for the B digit 0, a circuit path will be completed for relay FASD over the middle winding thereof. Thus, for example, it` the rst two digits of the code are-90, resulting in the operation of relays FAZ and FA7 in register A and relays FB4 and FB7 in register B, a circuit is completed for relay FASD which extends from ground on the No. 8 contacts of relay FA2, No. 6 contacts of relay FA7, conductor 9', No. 2 contacts of relay FB4, No. 2 contacts of relay FB7, conductor 127, middle winding of relay FA3D, to battery.

The right winding of relay FA3D is cross-connected to all stationary contacts of translating relays FAB2(), VFABSI and FAB80. As will be shown, the operation of relay FA3D results in those operations of the transverter by which the three digits of a foreign area code which is to be recorded as dialed will be recorded in the D, E and F digit spaces in the third line of a tive-line entry, 'as indicated in Fig. 13C.

As previously stated, not all foreign area codes are to be recorded as dialed. Certain of these codes, dependingupon the number for which provision is made in the circuit, may be compressed into single digits and recorded as such in an available digit space in a four-lineV initial entry, for example the B digitrspace in the second line of such entry. In the present embodiment of the invention, and only by way of example, provision is made for compressing a maximum of nine foreign area codes,

each of which, when so compressed represents the area in vwhich the call terminates. Y

A relay FAC- is provided for each one of the nine foreign Yareacodes to be compressed into a single digit, these relays being designated FACO FACS, and of which' relays'FAC() FACS only are shown in Fig. 11. The Nos.2 and'3 contacts of each of these relays are lselectively connected in accordance with the two-out-oftive'code to two of the (ive conductors in the cable FAC to express the particular digit to which the code assigned to the relay is to be compressed. 'Ihus relay FAC() indicates the digit 0, relay FAC1 indicates the digit 1, etc. with relay FACS (not shown) indicating the digit 8. The ve conductors in the cable FAC extend to five armatures (consolidated as armature group l) of relay C3, while the stationary contacts engaging said armatures are Yrespectively connected to conductors that extend to 'the-windings of recording magnets in the B magnet group of the recorder R. As previously stated, relay C3 operates for the second line of recording. If the foreign area code is to be compressed into one of the digits 8, then the appropriate one of the relays FAC() FACS will be operated, as will be described, in consequence of which the ground selectively applied to the two conductors in the cable FAC by the Nos. 2 and 3 contacts of said operated relay will complete the circuits of the two recording magnets in the B magnet group, operating said magnets and causing the digit represented by the operated relay FAC- to be punched in the B digit space of the second line in the two-out-of-five code. There are as many translating relays FAB- provided as there are codes whose rst two numerals are unlike.

As previously explained, those terminals 21 91 associated with relay FBI and those terminals 90 associated with relay FB7, which are expressive of for eign area codes that are to be recorded as dialed, are respectively commoned and connected by conductors 126 and 127 to the left and middle windings, respectively, of relay FASD. Those terminals in the groups 21 91 and 20 90 which are not commoned represent foreign area codes that are to be compressed, and such terminals are respectively extended to the windings of translating relays FAB'-. The above, however, should not be understood to mean that one relay FAB-- is provided for each code to be compressed. The circuit is so arranged that one relay FAB- is provided for each compressed code whose rst two numerals are unlike those of other codes to be compressed. For example, if the number of codes to be compressed is tive, and these codes are 206, 207, 815, 805 and 807, only three relays FAB- would be provided. Codes 206 and 207, having like rst and second digits, will require but one relay FAB20 for both codes, said relay FAB20 being connected to the terminal 20 by conductor 128. Codes 805 and S07 having also like lirst and second digits will require but one relay FABS, which is connected by conductor 130 to terminal 80. On the other hand, code 815 having its iirst two digits unlike any other compressible code will require a relay by itself, namely, relay FABSl, which is connected by conductor 129 to terminal 81. If nine separate codes are to be compressed all having unlike irst two digits, a relay FAB- would be provided for each such code.

The windings of the compression code relays FAC FACS of which, as said before, one is provided for each code to be compressed, are severally extended over armatures of the involved translating relays FAB- to the relays FC() FC7 of the digit register C. Depending upon which translating relay FAB- is operated in response to the partial code X0 or X1, a circuit is then completed over the relays of register C for the one compressed code relay FAC- which expresses the one digit into which the code is to be compressed. Thus, if it is assumed that the foreign area code 206 is to be compressed into the digit 0, then since relay FACt) is assigned to said latter digit, or code, the winding of said relay would be extended over a set of contacts on translating relay FAB20 (representing the partial code 20) to a contact o n one of the relays in register C, such that when said relay is operated as part of the two-out-of-tive code combination of relays for the digit 6, the circuit of the code compression relay FAC will be completed. Remembering that the tirst digit 2 results in the operation of relays FAG and FAZ in register A, that the second digit 0 results in the operation of relays F134 and F37 in register B, and that the third digit 6 results in the operation of relays PC2 and FC4 in register C, a circuit will be completed for relay FABZO in consequence of the operation of relays FAO and FAZ in register A for the digit 2 and relays FB4 and FB7 for .the digit 0, and a circuit will be completed for relay FAC() in consequence of the operation of relays FC4 and FCZ in register C, which latter circuit extends from battery, through the 14 winding of said relay PACO, No. 4 contacts of relay FABZG, conductor 171, No. 5 contacts of relay FC4, No. 7 contacts of relay PC2, to ground.

Thus by the operation of relay FACt), the code 206 will have been compressed into the digit 0, the latter digit being expressed by the grounding of the two conductors in the cable FAC that will result in the operation of punch magnets MB4 and MB7 in magnet group B of the recorder.

For the code 207 which, it may be assumed, is to be compressed into the digit 1, relay FACI would be assigned therefor. The circuit of this relay would be completed over the No. 3 contacts of relay FAZ() (the same translating relay being utilized for the code 207 as was utilized for the code 206 because the rst two digits of both codes are alike), conductor 172, No. 6 contacts of relay FC7, No. 6 contacts of relay FCG, to ground, said latter two relays operating in register C for the digit 7. On operating, relay FACl will cause the code 207 to be expressed by the digit l since its No. 2 and No. 3 contacts apply ground to the two conductors in the cable FAC which complete the circuit of punch magnets MB1 and MBO in magnet group B of the recorder.

The codes 815, 805 and 807, represented in this example by relays FACZ, FACS and FAC4 for compression into the digits 2, 3 and 4, respectively, are operated in the same manner from the setting of register C. However, since the code 815 causes the operation of relay FABSl by virtue of its first two digits causing the operation of relays FA1, FA7 in register A and relays FBQ, FE1 in register B, respectively, the circuit of relay FAC2, representing the code 815 to be compressed to the digit 2, is completed from battery through the winding of said relay, No. 5 contacts of relay FABSL conductor 173, No. 6 contacts of relay FCl, No. 6 contacts of relay FCl, to ground, said two relays in register C having been operated to register the third digit 5 of the code. On the other hand, codes 805 and 807 will both cause the operation of relay FABS since the second digit 0 will cause the operation of relays FB4 and FB7 in register B. Consequently, the circuit of relay FACS, representing the code 805, and the circuit of relay FAC4 representing the code 807 will be closed through the contacts of relay FABS@ to easily traceable grounds on the contacts of relays FCI and FC() in register C.

Relays FABC, FALK AND FACK serve as check relays. Relay FABC, as already noted, operates to determine that the relays in registers A and C have operated according to the two-out-of-iive code in registering the tirst and third digits, respectively, of the foreign area code, and that the relays in register B have operated in the designated pair for digit l (relays FB() and FBI) and in the designated pair (relays FB and F137) to register the second digit of the code. Relay FABC is made slow in operating to allow time for the slowest FA-, FB-, or FC- relay in the registers A, B and C, respectively, to operate if its circuit is closed. When operated, relay FABC, at its No. 3 contacts, closes a circuit for slowoperate relay FALK, which operates and closes a point in the circuit of relay PACK at its No. l contacts.

Relay FACK checks to insure either that relay FA3D is operated if the foreign area code is to be recorded as dialed, or that one, and only one, of the code compression relays FACl FAC4 is operated. lf relay FASD is not operated, thereby indicating a compression of the foreign area code registered in registers A, B and C, and a compression code relay FAC- is operated, thereby indicating that the code is to be compressed (assume that relay FAC4 is operated for the compression of the code 807 to the single digit 4) then relay FACK is energized over a path extending from battery through its winding, No. l contacts of relay FALK, conductor 132, No. 3 normally made contacts of relay FA3D, the No. 6 front contacts of relay FAC4, serially through the No. 6 back contacts of relay FACS FACO, to

ground. The operation of relay PACK checks that one, and only one, of the code compression relays has been operated, since it is obvious that if two or more of said relays are operated, the above circuit cannot be completed.

f relay PAST) is operated, thereby indicating that the foreign area code registered in registers A, B and C is to be recorded as dialed (live-line initial entry), and none of the relays PAC-G PAC4 is operated, then upon the operation of relay PALK, an alternate circuit is cornpleted for relay PACK, said alternate circuit extending from battery through the winding of said relay, No. l contacts of relay PALK, conductor 132, No. 3 operated contacts of relay PASD, serially through the No. 6 back contacts or" relays PAC PAC4, to ground. lt should be noted that one of the relays PAC@ PACd is operated at the operated, the circuit of relay PACK will not be closed.

Upon operating, relay PACK locks over its upper No. 2 contacts, conductor i331, to ground on the No. 2 contacts or relay CP7, further extends ground from the contacts of relay RK, conductor i313, its own No. 6 contacts, No. 2 contacts of relay PALK to the right winding thereof, the No. 2 contacts of relay PABC to the left winding thereof, thus locking said latter relays. At its No. 3 contacts, relay PACK opens the circuit of relay PCE. which, upon releasing, opens the connection between the conductor groups A, B and C and the relays of registers A, B and C, respectively, thereby to cause the relays operated in said registers to release. lt should be noted, however, that the grounds selectively applied to said conductor groups in the sender to express the three digits of the foreignarea code, remain so applied. The operated relay PAC- which represents the foreign area code to be compressed, it the code is to be compressed (rela PAC, in the given example), or operated relay PASD if the code is to be recorded as dialed, remains locked to oinorrnal ground, the former relay over its No. l contacts, conductor 135, No. 3 contacts of relay CKE, to ground; the latter relay over its right winding and No. 3 contacts, conductor 135 to the same ground. As will be shortly described, relay PAC- (relay FAC4 in the given example) in the case of code compression, needs to remain operated to cause the compressed code to be recorded as a single digit in the i3 digit position of the second line of a tour-line initial entry, while relay PASD, in case the three digits or" the foreign area code are to be recorded as dialed, needs to remain operated to cause said three digits to be recorded in the D, E and P digit spaces of the third line ot' a live-line initial entry.

Having described the particulars of the apparatus and circuit arrangement which have been provided in the transverter to compress certain foreign area codes into single digits and to record certain others as dialed, l will now describe the operation of the transverter as modiiied by my invention. Those operations orn the transverter which have already been completely described in the above-mentioned Cahill et al. application will be sketched in briefly wherever necessary to provide enough operational background for a complete understanding of the operation oi the invention. Reference, vtherefore, is made to the above-mentioned application for such operations of the transverter as are not completely described herein.

When the transverter becomes connected to the outgoing sender S, the latter transmits to the transverter certain items of information which the transverter needs for directively guiding the items of record to the appropriate lines and digit positions of the record including the stations digit, which is registered on the stations register shown in Pig. 8. Among such items of information is whether the initial entry to ce recorded is a touoline initial entry, in which case relay @EL is operated, or a two-line initial entry in which case relay 2L is operated, Whether the called number is four digits, resulting in the same time that relay PA3D is` operation of relay 4DG, or ve digits resulting in the operation of relay SDG.

in the present embodiment of the invention the initial entry is either a four-line :initial entry or a tive-line initial entry. But in either case, relay 4L is always operated. The sender also selectively grounds two of the tive conductors in each of the conductor groups A K in accordance with the digit which each of said lgroups is to express for recording, and it has already been shown that the grounding of conductor groups A, B and C according to the three digits of the foreign area code results in the operation of relay FASD if such code isV to be recorded as dialed, and in the operation of one of the compression code relays FAC() PAC4 if the indicated code is to be compressed into a single digit. it will further be recalled that the operation of relay PASD or the operation of one of the relays PAC() PACi (relay PAC4, for example) etects the operation of relay PACK. When the latter operates', a circuit is closed for relay PAI, which circuit extends from battery through the winding of said relay, conductor 145, No. 2 contacts or" relay PA3D (if said relay is operated), conductor 146, No. 5 contacts of relay PACK, No. l contacts of relay PALK, conductor 132, No. 3 front contacts of relay PASD, serially through the No. 6 back contacts of relays PAC4 PACO, to ground. If relay PASD is not operated, relay PAI also will not be operated. But whether relay PA3D is operated because the code is to be recorded as dialed, or whether one of the relays PAC4 FAC() is operated because the code is to be compressed, relays PAZ and PAS will operate over the following two alternate paths. If relay PASD is operated, the circuit of relays FAZ and PAS extends from battery through their respective windings, conductor 147, No. 5 contacts of relay PACK, No. l contacts or relay PALK, conductor 132, No. 3 front contacts ol relay PA3D, serially through the No. 6 back contacts of relays PAC4 PACO, to ground. If relay PASD is not operated, the circuit extends as traced to conductor 232, but because said relay is normal, the path continues over its normal No. 3 contacts, No. 6 front contacts of relay PAC4 (assumed to be operated) and thence as traced to ground.

When relay PA2 operates, the ve conductors in conductor group K, selectively grounded in the sender to express the value of the stations digit, are extended to the windings of the relays STO ST7 of the stations register. lf the numerical portion of the called subscribers number consists of four digits, relay 4DG will be operated, and the sender further grounds lead K7 (in said conductor group K) over which, through the No. ll contacts of relay PA2, relay ST7 is operated. Said relay locks over its No. 4 contacts to ground on conductor 123, and completes the circuit of relay EST from battery through its winding, No. 3 contacts of relay ST7, No. 3 back contacts of relay ST4, No. 3 back contacts of relay ST2, No. 2 back contacts of relay ST1, No. l back contacts of relay STO, conductor 174, No. l contacts of relay PAZ, No. 8 contacts of relay PAS, through certain other control equipment (not shown) it the foreign area code is not to be recorded as dialed, conductor 175, No. 3 contacts of relay CP7, No. 3 contacts of relay CP2, No. 3 back contacts of relay SDG, No. 4 back contacts of relay LST, No. 1 front contacts of relay 4DG, conductor 176, No. l contacts of relay CKS, to ground. ln the event that the foreign area code is to be recorded as dialed (live-line initial entry) then relay PAl will be operated, as alreadyexplained, relay PAL will be operated, as will be explained, and the above path traced to the No. 8 contacts of relay PAS will extend over the No. 20 contacts of relay FAI, conductor 177, No. 4 contacts of -relay PALconduetor 178, No. 2l contacts of relay PAI, and thence as traced to ground on the No. l contacts of relay CKE. Relay EST operates Lo perform a function to be described herein- 

